Re: [Discuss-gnuradio] GNU Radio conditional operation

[Mike Clark]

I recently started using the USRP at work, so I thought I'd share a few things. Obviously python is important (http://diveintopython.org/ is a good resource). To learn the basics of how gnuradio works, it helped me to use gnuradio-companion. So what I would do is put together some blocks in grc and look at the generated python code. I've been writing my experiences on my blog which some might find useful (http://pwnhome.wordpress.com/gnuradio-and-usrp/). I am not an RF guy (CS background), so there are a lot of things that I still don't understand, but hopefully this will help.

On Wed, Apr 27, 2011 at 6:00 PM, Vijay Pillai <address@hidden> wrote:

Hi Marcus and the folks at Ettus,

I am an extremely satisfied and happy user of your USRP's. We plan on buying a lot more USRP's for our company since it is an outstanding cost effective platform for testing and measurements.

However if I have to offer some criticism (and I assure you that this is the only complaint that I have amidst all the good things i have to say), it is about the threadbare documentation available on getting started with doing applications - whether that be for GRC, or python programming for the USRP. I had to google the web for some examples and this is how I learnt. There has to be a much easier way to getting started. The folks at Ettus attribute too much intelligence to the average user if this how they expect people to learn; it is actually a disservice to Ettus as a company to make it so hard to start using your products.

Hope what i have said above does not in any way detract from the overall considerably positive feedback that i would like to convey.

Best regards,
-Vijay

--- On Wed, 4/27/11, Marcus D. Leech <address@hidden> wrote:

From: Marcus D. Leech <address@hidden>
Subject: Re: [Discuss-gnuradio] GNU Radio conditional operation
To: address@hidden
Date: Wednesday, April 27, 2011, 12:40 PM

On 27/04/2011 12:27 PM, Songsong Gee wrote:
> Thank you for your answer.
>
> I have one more question,
> In that directory, there are lots of python script,
> Unfortunately, I'm not good at that language
> and I have just learned GNU Radio with GRC
>
> Is that what I wanted now available in GRC?
>
Generally, custom processing blocks, which is what you'll likely be having to do, are written in C++.

In Gnu Radio, the Python is used as a kind of "glue" that sets up and "manages" flow-graphs, but the
  underlying signal-processing elements, and buffer and task scheduling is generally handled in C code.
  The vast majority of those blocks have mappings into Python (via Swig) to allow the Python
  ``management` structure to manage them.

GRC emits Python code, using the underlying Gnu Radio conventions and mechanisms to form a flow-graph.

Blocks you write yourself can be ``manifested`` (via Swig) into Python, and then ``manifested`` via XML into
  GRC.

The XML that GRC uses exists as a way of describing the ``surface`` of a processing block, and also as a way of
  describing the Python code that must be emitted in order to plug the block into the overall flow-graph.





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